I Havent done it but since John states its well worth the investment I am going to do it myself next week. Swapping the intake manifold is pretty simple you just have to unbolt it swap the parts from the old one onto the new one then bolt the new one back on. You should replace the gasket is it is worn as well. On a scale of 1-10 its probaly a 3. My motor is out of the car so it take me all of 5 minutes to unbolt and disconnect the manifold and probaly 5 min to rebolt it up.